89Sr在临床上治疗骨转移癌，其半衰期为（）。 A.14.3天 B.8.04天 C.

This chart shows the top 10 songs from TOP HITS HOT 100 of the week ending July 8,2003.

This Week	1 Week Ago	2 Weeks Ago	3 Weeks Ago	Title	Performer, Lyricist, Producer, Record Company	Weeks on Chart
1	3	5	9	BACK FOR GOOD	Take That G Barlow Chris Poter And Gary Arlow BMG	10
2	2	1	2	RUN AWAY	The Real McCoy J Wind, Oickmix, Jeglitzs Fresh Line And Bermarr Brothers MBG	11
3	1	2	3	HERE’S JOHNNY	Hoeus Pocus Xtro And Cubrick Xtro And Cubrick Central Station Records	9
4	4	3	5	TOTAL ECLIPSE OF THE HEART	Nieki French Jim Steiman J Spingate Shock	10
5	5	4	1	THINK TWICE	Celine Dion A Hill And P Sinfild Christopher Neil Sony	12
6	9	12	14	SUKIYA KI	4 Pm H Nakamura Veit Renn Folygram	3
7	8	17	19	MOUTH	Merril Bainbridge Ross Fraser George Siewooi And Owen Boeweell BMG	8
8	19	31	77	EVERYB ODY ON THE FLOOR	Tokyo Ghetto Pussy Tokyo Ghetto Pussy Trancy Spacer Stony Records	4
9	6	9	13	COTTO N EYE JOE	Rednex Jan Ericsson Pat Reiniz BMG	107
10	14	14	34	STRON G ENOUG H	Sheryl Crow, David Baerwald, Kevin Gilbert, David Rickett＆Brain Macleod Bill Bottrell Polygram	7

63．The song that has risen most in the chart over the three weeks is         .
A．Mouth                                                B．Cotton Eye Joe   
C．Strong Enough                                    D．Everybody on the Floor
64．Which song has been in the chart for the longest period?
A．Back for the Good                               B．Cotton Eye Joe
C．SUKIYAKJ                                         D．Strong Enough
65．The performer who had the song with best rank two weeks ago is           .
A．Merril Bainbridge                                                               B．H Nakamura
C．The Real McCoy                                  D．Tokyo Ghetto Pussy
66．The chart shows that Mouth is         .
A．becoming less popular each week          B．becoming more popular each week
C．the most popular song on the chart        D．as popular as when it entered the chart